How to remove widgeted area for a page/wiki in thematic theme

Hi,

I’m trying to create a wiki on a website. It’s a child theme of the thematic theme.

The problem is that the page has a primary/secondary aside so the wiki plugin that I’m using only appears in the secondary aside and doesn’t take up the whole page width – it looks really squished.

How can I change the php/css (or whatever) to get a full page for my wiki?

Thanks!